Created
March 7, 2017 04:51
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GAE Concurrency Test2 (With transaction)
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| import webapp2 | |
| import logging | |
| from google.appengine.ext import ndb | |
| @ndb.transactional(retries=10) | |
| def update_bank_account(key, by=1): | |
| account = BankAccount.get_by_id(key) | |
| if account: | |
| account.amount += by | |
| account.put() | |
| return True | |
| return False | |
| class BankAccount(ndb.Model): | |
| amount = ndb.IntegerProperty(default=0) | |
| redirect_html = '''<html> | |
| <head> | |
| <meta http-equiv="refresh" content="1; url=http://{host}/" /> | |
| </head> | |
| <body><pre>Will redirect you back to home page in 1 second.</pre></body> | |
| </html> | |
| ''' | |
| class MainHandler(webapp2.RequestHandler): | |
| def get(self): | |
| key = 'edward' | |
| account = BankAccount.get_by_id(key) | |
| if not account: | |
| self.abort(404, 'Your account not found. may be create one?') | |
| self.response.headers['content-type'] = 'text/plain' | |
| self.response.write('Hello\n{} you have ${} in your account.'.format(key, account.amount)) | |
| def init(self): | |
| model = BankAccount.get_or_insert('edward', amount=0) | |
| model.amount = 0 | |
| model.put() | |
| self.redirect('/') | |
| def inc(self): | |
| key = 'edward' | |
| try: | |
| update_bank_account(key, by=1) | |
| self.response.headers['content-type'] = 'text/html' | |
| self.response.write(redirect_html.format(host=self.request.host)) | |
| except Exception as e: | |
| logging.exception(e) | |
| app = webapp2.WSGIApplication([ | |
| webapp2.Route('/init', handler='main.MainHandler:init'), | |
| webapp2.Route('/inc', handler='main.MainHandler:inc'), | |
| ('/*', MainHandler), | |
| ], debug=True) |
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